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ISO 8601 date handling

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/*
 * Copyright 2010, Strategic Gains, Inc.
 *
 * Licensed under the Apache License, Version 2.0 (the "License");
 * you may not use this file except in compliance with the License.
 *
 * You may obtain a copy of the License at
 *
 *     http://www.apache.org/licenses/LICENSE-2.0
 *
 * Unless required by applicable law or agreed to in writing, software
 * distributed under the License is distributed on an "AS IS" BASIS,
 * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
 * See the License for the specific language governing permissions and
 * limitations under the License.
 */

package com.strategicgains.util.date;

import java.util.regex.Matcher;
import java.util.regex.Pattern;

import com.strategicgains.util.AdapterCallback;

/**
 * Utilizes regular expressions to augment the Java SimpleDateFormat handling for ISO 8601.  Called by
 * Iso8601TimestampAdapter before parsing the date string, this callback checks to see if the timezone
 * offset is abbreviated (e.g. of the form "+/-HH") or contains a colon (e.g. +/-HH:MM).  If so, 
 * string substitution is performed and the augmented string returned to the parser.
 * 
 * @author Todd Fredrich
 * @since April 7, 2010
 */
public class Iso8601TimepointCallback
implements AdapterCallback
{
	private static final String SHORT_TZ_REGEX = ".*T.*[-+]\\d\\d$";
	private static final String COLON_DELIM_TZ_REGEX = "([-+]\\d\\d):(\\d\\d)$";
	
	private static final Pattern SHORT_TZ_PATTERN = Pattern.compile(SHORT_TZ_REGEX);
	private static final Pattern COLON_TZ_PATTERN = Pattern.compile(".*T.*" + COLON_DELIM_TZ_REGEX);

	@Override
	public String process(String string)
	{
		Matcher colonMatcher = COLON_TZ_PATTERN.matcher(string);

		if (colonMatcher.matches())
		{
			return string.replaceAll(COLON_DELIM_TZ_REGEX, colonMatcher.group(1) + colonMatcher.group(2));
		}
		else if (SHORT_TZ_PATTERN.matcher(string).matches())
		{
			return string + "00";
		}

		return string;
	}
}